Long/Short equity leverage

I am just trying to find out how much leverage a long/short equity hedge fund can take using a prime broker. I understand it's also a function of the relationship between the prime broker and the hedge fund; but I would just like a rough estimate.

I've heard that a 10 million USD long/short equirt fund can have exposure of more than 100 million long/100 million short. Of course, the fund is delta neutral.